You have the ability to duplicate Boolean objects and synchronize changes made on one to affect all the others.
- Select a boolean object.
- Hold Shift and select the object on which you want to duplicate the object already selected.
- F →
- Optional : press X/Y/Z to rotate the copy.
- Left click to put a copy.
- Right click to quit.
- Select a duplicated Fluent boolean object.
- F → →